like the determinist) generally sees too much cause
in everything. The madman would read a conspiratorial significance
into those empty activities. He would think that the lopping
of the grass was an attack on private property. He would think
that the kicking of the heels was a signal to an accomplice.
If the madman could for an instant become careless, he would
become sane. Every one who has had the misfortune to talk with people
in the heart or on the edge of mental disorder, knows that their
most sinister quality is a horrible clarity of detail; a connecting
of one thing with another in a map more elaborate than a maze.
If you argue with a madman, it is extremely probable that you will
get the worst of it; for in many ways his mind moves all the quicker
for not being delayed by the things that go with good judgment.
He is not hampered by a sense of humour or by charity, or by the dumb
certainties of experience. He is the more logical for losing certain
sane affections. Indeed, the common phrase for insanity is in this
respect a misleading one. The madman is not the man who has lost
his reason. The madman is the man who has lost everything except
his reason.

The madman's explanation of a thing is always complete, and often
in a purely rational sense satisfactory. Or, to speak more strictly,
the insane explanation, if not conclusive, is at least unanswerable;
this may be observed specially in the two or three commonest kinds
of madness. If a man says (for instance) that men have a conspiracy
against him, you cannot dispute it except by saying that all the men
deny that they are conspirators; which is exactly what conspirators
would do. His explanation covers the facts as much as yours.
Or if a man says that he is the rightful King of England, it is no
complete answer to say that the existing authorities call him mad;
for if he were King of England that might be the wisest thing for the
existing authorities to do. Or if a man says that he is Jesus Christ,
it is no answer to tell him that the world denies his divinity;
for the world denied Christ's.

Nevertheless he is wrong. But if we attempt to trace his error
in exact terms, we shall not find it quite so easy as we had supposed.
Perhaps the nearest we can get to expressing it is to say this:
that his mind moves in a perfect but narrow circle. A small circle
is quite as infinite as a large circle; but, though it is quite
as infinite, it is n